William Fitzwilliam, 3rd Viscount Fitzwilliam,
born est c.1610,
living in Dundrum Castle at the time of the outbreak of
the Rebellion in Oct 1641,
was driven out of it by the rebels,
who themselves were driven out Jan 1642,
his father and brother were also having to deal with rebels at this time,
living in Dundrum Castle again as at 1646,
mar Mary Luttrell
[born est c.1620,
descendant of Edward I],
the Fitzwilliams had left
Dundrum Castle by 1653, and did not live there again,
after the Restoration 1660 he lived at Simmonscourt Castle,
succ 1667,
died parish of St.Nicholas Within, Dublin
(the area just in front of Christ Church, on the S side of it), 1675, age est c.65 yrs,
Catholic, bur Donnybrook church,
having had issue: